WO2013036923A1 - Frein de stationnement à étrier coulissant ayant une rétraction de patin de frein positive - Google Patents

Frein de stationnement à étrier coulissant ayant une rétraction de patin de frein positive Download PDF

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Publication number
WO2013036923A1
WO2013036923A1 PCT/US2012/054447 US2012054447W WO2013036923A1 WO 2013036923 A1 WO2013036923 A1 WO 2013036923A1 US 2012054447 W US2012054447 W US 2012054447W WO 2013036923 A1 WO2013036923 A1 WO 2013036923A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
caliper
piston
rotor
caliper body
Prior art date
Application number
PCT/US2012/054447
Other languages
English (en)
Inventor
Donald L. Burgoon
Darin E. Cate
Original Assignee
Performance Friction Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Performance Friction Corporation filed Critical Performance Friction Corporation
Publication of WO2013036923A1 publication Critical patent/WO2013036923A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/741—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
    • F16D55/2265—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing
    • F16D55/22655—Constructional details of guide pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
    • F16D55/2265—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing
    • F16D55/227—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing by two or more pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
    • F16D65/183—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes with force-transmitting members arranged side by side acting on a spot type force-applying member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/38—Slack adjusters
    • F16D65/40—Slack adjusters mechanical
    • F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
    • F16D65/54—Slack adjusters mechanical self-acting in one direction for adjusting excessive play by means of direct linear adjustment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
    • F16D2121/06—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure for releasing a normally applied brake

Definitions

  • This invention generally relates to brake calipers, and is specifically concerned with a sliding caliper parking brake that positively retracts both the inner and outer brake pads from the brake rotor when the parking brake is released.
  • Disc-type parking brakes utilizing sliding calipers are known in the prior art.
  • Such parking brakes generally include a caliper body sidably mounted on a pair of parallel pins affixed to the vehicle suspension. Such a mounting allows the caliper body to slide back and forth a short distance parallel to the axis of rotation of the wheel.
  • the caliper body has a slot-shaped recess that receives the outer periphery of a brake rotor.
  • the caliper body On one side of the recess, the caliper body includes a pair of cylindrical bores that house a pair of spring-loaded brake pistons. These pistons are connected to an inner brake pad that is extendible toward and retractable away from the brake rotor.
  • An outer brake pad is connected to the caliper body on the outer wall of the rotor-receiving recess opposite to the inner brake pad such that the outer periphery of the brake rotor is disposed between the inner and outer brake pads.
  • the brake pistons are retracted against the force of their internally-contained springs by pressurized brake fluid acting against the front ends of the pistons.
  • the pressurized brake fluid is released from the bores housing the pistons, which allows the piston springs to extend the pistons toward the brake rotor.
  • the extended brake pistons forcefully engage the inner brake pad against the inner surface of the brake rotor.
  • Such sliding caliper parking brakes have a number of advantages.
  • the ability of the caliper body to slide in the axial direction upon the actuation of the brake allows the brake pistons to be mounted on only one side of the caliper body, thereby simplifying construction, reducing parts and reducing the size and weight of the brake.
  • the use of spring force instead of hydraulic force to extend the brake pistons allows the parking brake to reliably apply a braking force against the brake rotor without power from the vehicle, and regardless of whether pressurized brake fluid is available or leaks out of the piston bores of the caliper body.
  • the delayed retraction of the outer pad from the rotor causes uneven wear patterns between the inner and outer pads, thereby compromising the ability of the parking brake to apply sufficient braking forces.
  • Such drag also increases fuel consumption since the vehicle engine must overcome the frictional forces applied by the lagging outer pad against the brake rotor. If the magnitude of the drag is high enough the resulting heat can damage the brake rotor and components of the caliper.
  • the invention is a sliding caliper parking brake that solves the aforementioned problems by providing positive retraction of the outer brake pad upon de-actuation of the parking brake.
  • the invention comprises a caliper body; a mounting assembly that movably mounts the caliper body with respect to a brake rotor; an inner brake pad that is extendible from and retractable toward the caliper body into engagement and disengagement with an inner side of the brake rotor; and an outer brake pad fixedly connected to the caliper body that is moved into engagement with an outer side of the brake rotor when the caliper body slidably moves along the mounting assembly as a result of the inner brake pad extending into engagement with the inner side of the brake rotor.
  • the mounting assembly includes a resilient member that slides the movable caliper body back to its initial, pre-braking position with respect to the brake rotor when the parking brake is released. Such movement of the caliper body positively disengages the outer brake pad from the outer side of the brake rotor when the inner brake pad is retracted out of engagement with the inner side of the brake rotor.
  • the mounting assembly includes at least one sleeve, such as a pair of parallel pins mounted on the vehicle suspension that slidably engage complementary-shaped parallel bores in the caliper body.
  • the resilient member may include at least one spring, and is preferably formed from one or more Belleville springs. The stroke length of the resilient member of the mounting assembly is pre-selected to be about one-half of a stroke length of the inner brake pad so that the rotor is centered between the inner and outer brake pads when the parking brake is released.
  • the mounting assembly may include a self-adjusting stroke length mechanism that maintains the stroke length of the resilient member to about one-half of the stroke length of the inner brake pad despite wear on the inner brake pad.
  • This mechanism may include a retaining member that retains the resilient member of the mounting assembly and which is frictionally engaged to the sleeve. The frictional engagement between the retaining member and sleeve is sufficient to prevent the retaining member from sliding on the sleeve when the resilient member is compressed a preselected distance equal to about one-half the stroke length of a wear- free inner pad, but insufficient to prevent said collar from sliding on said sleeve when the resilient member is compressed beyond the preselected distance.
  • the piston assembly may also include a piston movably mounted in a bore in the caliper body and having an end connected to the inner brake pad, a retention cap affixed to the caliper body that faces an opposite end of the piston, and at least one spring member disposed between the piston and the retention cap.
  • the piston is retractable away from said brake rotor by the application of pressurized hydraulic fluid on a face of the piston, and extendible toward said brake rotor by the application of spring force from the spring member between the piston and the retention cap.
  • the retention cap may include an adjustment member such as a screw that adjusts both the stroke length of the spring member and an amount of engagement force that the inner brake pad applies to the inside surface of the brake rotor.
  • Figure 1 is a front side view of the sliding caliper parking brake of the invention, illustrating the caliper, brake rotor and vehicle suspension upright (in phantom) that the caliper is attached to;
  • Figure 2 is a perspective view of the caliper of the parking brake of Figure 1;
  • Figure 3 is cross sectional side view of the parking brake of Figure 2 along the section line 3-3.
  • Figure 4 is cross sectional side view of the parking brake of Figure 2 along the section line 4-4.
  • the sliding caliper parking brake 1 of the invention generally comprises a caliper 3 mounted on the upright 5 of a vehicle suspension (shown in phantom), and a disc-shaped brake rotor 7 that is connected to the hub of a vehicle wheel (not shown).
  • the caliper 3 includes a caliper body 8 having an arcuate recess 9 on its right side.
  • the recess 9 includes an inner wall 10 and an outer wall 11 and receives the outer periphery of the brake rotor 7.
  • the caliper body 8 is connected to the upright 5 of the vehicle suspension by a mounting assembly 12 that movably mounts the caliper body 8 with respect to the brake rotor 7.
  • mounting assembly 12 includes a pair of slide pins 14a, 14b on opposite ends of the caliper body 8.
  • each of the pins 14a, 14b slidably extends through a bore in the caliper body 8.
  • the threaded ends of the pins 14a, 14b are screwed in to the upright 5.
  • the upright 5 extends through the recess 9 of the caliper body 8 adjacent to the inner wall 10.
  • the caliper 3 is slidably movable a short distance along the shanks of the slide pins 14a, 15b in a direction parallel to the axis of rotation of the brake rotor 7 upon actuation and release of the parking brake 1.
  • the recess 9 of the caliper body 8 further includes inner and outer brake pads 16a, 16b arranged in opposition to one another, each of which includes a metal backing plate 18a, 18b and a pad 20a, 20b.
  • the inner brake pad 16a is mounted on the ends of a pair of piston assemblies which extend and retract the pad 16a toward and away from the brake rotor 7.
  • the outer brake pad 16b is mounted on the outer wall 11 of the recess 9 of the caliper body 3.
  • Outer brake pad 16b is engaged to and disengaged from the brake rotor 7 as a result of the reactive force generated against the caliper 3 when the inner brake pad 16a engages the brake rotor 7, and the sliding movement afforded to the caliper 3 from the slide pins 14a, 14b forming the mounting assembly 12.
  • the top side of the recess 9 of the caliper body 8 includes guide pins 22 that are slidably received in recesses 24 in the outer edges of the backing plates 18a, 18b of the brake pads 16a, and 16b. These guide pins 22 maintain a parallel relationship between the flat pad surfaces 25a, 25b of the brake pads 16a, and 16b.
  • the front side of the caliper body 8 includes a brake fluid inlet 26 and outlet 28 for the operation of piston assemblies 30a and 30b connected to the inner brake pad 16a.
  • each of the piston assemblies 30a, 30b is housed within a cylindrical bore 32.
  • Each of the bores 32 has an open end 34 in the front side of the caliper body 8 that is circumscribed by threads 35, and which terminates in an annular wall 36 as shown.
  • Each of the piston assemblies 30a, 30b includes a piston 40 having an annular front face 42 that is spaced apart from the annular wall 36 at the end of the bore 32.
  • the piston 40 includes a concentric, integrally-formed stem 44 that projects outwardly from the front face 42 as shown.
  • the distal end of the stem 44 is coupled to a circular mounting plate 46 which is in turn affixed via a screw (not shown) to the backing plate 18a of the brake pad 16a.
  • the piston stem 44 includes a recess 48 that receives a boss 50 projecting from the back of the mounting plate 46.
  • the stem 44 and boss 46 are coupled together by a retaining ring 52 snapped into axially aligned annular recesses (not specifically shown) circumscribing the stem 44 and boss 50.
  • the brake fluid inlet 26 and outlet 28 are connected to passageways in the caliper body 8 that end in the annular wall 36 so that pressurized brake fluid may be injected into the space between the front face 42 of the piston 40 and the annular wall 36 to release the parking brake 1, or bled from this space to actuate the parking brake 1.
  • Piston 40 further has a back wall 54 as shown.
  • Each of the piston assemblies 30a, 30b further includes a retaining cap 56.
  • Cap 56 has screw threads 57 that are engaged to the screw threads 35 circumscribing the open end 34 of the cylindrical bore 32.
  • a radially- oriented set screw 58 mounted in a figure-8 shaped retaining ring 60 secures the retaining cap 56 into position with respect to the threaded open end 34 of the bore 32.
  • the retaining cap 56 has a front wall 61 that faces the back wall 54 of piston 40.
  • Each of the piston assemblies 30a, 30b further includes a piston spring 62 within an annular recess 63 within the piston 40.
  • piston spring 62 is formed from a stack of Belleville springs 64 that are compressed between the piston 40 and the retaining cap 56 so that the piston 40 is spring-biased toward the brake rotor 7.
  • Each of the piston assemblies 30a, 30b also includes a pre-load adjustment screw 66 whose threads are engaged to a threaded bore 67 disposed in the piston 40 and aligned with its axis of rotation.
  • the adjustment screw 66 adjusts the distance "X" between the back wall 54 of the piston 40 and the front wall 61 of the retaining cap 56, and is used both to initially adjust the engagement force that the inner brake pad 16a applies to the brake rotor 5, and to re-adjust this engagement force as the brake pads 16a, 16b and brake rotor 7 wear down.
  • This distance "X” should be set slightly longer than a stroke distance "S” of the pistons 40 required for a braking operation to ensure that the full compressive force of the piston springs 62 is used to engage the brake pads 16a, 16b against the sides of the rotor.
  • FIG 4 illustrates the structure of the slide pins 14a, 14b of the mounting assembly 12 of the parking brake 1.
  • Each of the slide pins 14a, 14b includes bolt 70 having a head portion 72 extending out of the front side of the caliper body 8, and a threaded end screwed into a threaded bore 75 in the upright 5 of the vehicle suspension.
  • the shank of the bolt 70 is slidably received within a tubular sleeve 76 which in turn is slidably received within a bore 78 in the caliper body 8.
  • An annular dust boot 80 circumscribes the distal end of the sleeve 76 in order to keep dust and debris from accumulating between the outer surface of the sleeve 76 and the surface of the bore 78.
  • O-rings 82a, 82b are provided to keep the sleeve 76 centered within the bore 78 when the parking brake 1 is released. These O-rings 82a, 82b are retained in annular grooves circumscribing the bore 78 and surround both the bore 78 and the sleeve 76.
  • each of the slide pins 14a, 14b includes a resilient member 85 in the form of a stack of Belleville springs or, as shown, a wave spring 86 which applies a restorative force to the caliper 3 after the parking brake is released. While a wave spring or a stack of Belleville springs 86 are used in this example of the invention, a coil spring, leaf spring, one or more pieces of elastomeric material or a single Belleville spring could also be used. These wave or Belleville springs 86 are captured between an annular bottom wall 88 of a threaded annular recess 90, and a split ring retention collar 92 frictionally engaged around the proximal end of the sleeve 76.
  • a dust cap 94 (shown in Figure 4 but not shown in Figures 1 and 2) having a threaded end 96 is screwed into the threaded annular recess 90 of the caliper body 8 to protect the proximal end of the slide pin 14a from dust and debris.
  • the stroke distance X is somewhat larger than or just about equal to an actual stroke distance S that the pistons 40 will move in engaging the brake pads 16a, 16b against the sides of the brake rotor 7. Such an adjustment of the stroke distance X ensures that the piston-springs 62 will be able to apply sufficient braking force to the rotor 7 even after the pads 16a, 16b and rotor have experienced some degree of wear.
  • the brake fluid outlet 28 is opened to allow pressurized brake fluid to bleed out of the space between the annular wall 36 of the bore 32 and the piston face 42 in each of the piston assemblies 30a, 30b. Consequently, the force that the piston spring 62 applies to the piston 40 of each of the piston assemblies 30a, 30b moves the brake pad 16a connected to the piston stem 44 into engagement with the inner side of the brake rotor 7. This brake engagement force generates an equal and opposite reaction force between the brake rotor 7 and the caliper body 8 that pushes the left side of caliper body 8 away from the brake rotor 7.
  • the caliper body 8 is slidably movable with respect to the brake rotor 7 via the sliding pin assemblies 14a, 14b, the caliper body 8 slides to the left in Figure 4 away from the vehicle suspension upright 5.
  • Such sliding movement causes the outer wall 11 of the recess 9 of the caliper body 8 to move toward the outer side brake rotor 7, which in turn engages outer brake pad 16b against the outer side of the brake rotor 7.
  • this leftward movement caused by the piston springs 62 overcomes the spring force applied to the caliper body 8 by the resilient member 85 formed by the wave spring or other spring stack 86 and compresses it.
  • the piston 40 of each of the piston assemblies 30a, 30b has extended toward the rotor 7 a total distance of S while each of the resilient members 85 has been compressed a distance 0.50 S away from the rotor 7 and each of the brake pads 16a, 16b has moved a distance 0.50 S toward the rotor.
  • the restorative force that the compressed resilient members 85 apply to the caliper body 8 pushes it toward the brake rotor upright 5 of the vehicle suspension , which in turn forces the outer brake pad 16b away from the outer surface of the brake rotor 7.
  • the applicants have noted that because the pistons 30 positively withdraw the inner brake pad 16a a distance of 0.50 via pressurized brake fluid, that the stroke of the resilient members 85 need only be 0.50 S to positively withdraw the outer brake pad 16a away from the brake rotor 7 the same distance that the pistons 30 withdraw the inner brake pad 16b from the brake rotor 7.
  • the use of a spring stroke of only 0.50 S instead of S in turn minimizes any diminishment of the engaging force between the brake pads 16a, 16b and the brake rotor 7 that might be caused by the resilient members 85 when the parking brake 1 is actuated.
  • Such a stroke increase is accomplished by means of the split-ring collar 92 that circumscribes the outer surface of the tubular sleeve 76 of each of the slide-pin assemblies 14a, 14b.
  • the frictional engagement force between the split-ring collar 92 and the outer surface of the tubular sleeve 76 is set to a value that is high enough to retain the slide-pin spring stack 86 when the spring stack is compressed a distance corresponding to 0.50 S when the brake pads 16a, 16b and rotor are unworn, but low enough so that the collar 92 slips when the spring stacks 62 compress the slide-pin spring stacks 86 a distance greater than the initial value of 0.50 S as the brake pads 16a, 16b and brake rotor 7 wear.
  • the frictionally-engaged split collar 92 affords self-adjustability to the stroke of the slide-pin spring stacks 86 so that their restorative spring stroke increases as the stroke length of the pistons 40 increases over the lifetime of the parking brake 1.
  • the end result is that the slide-pin spring stacks 86 retract the outer brake pad 16b away from the outer surface of the brake rotor the same distance that the pistons 40 retract the inner brake pad 16a away from the inner surface of the rotor 7 (i.e. 0.50 S) despite the gradual increase in the length of 0.50 S as a result of brake wear. 26] It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present invention.

Abstract

L'invention porte sur un frein de stationnement à étrier coulissant qui rétracte de manière positive à la fois les patins de frein extérieur et intérieur lors d'un désactionnement du frein de stationnement. Le frein de stationnement comprend un corps d'étrier, un ensemble de montage qui permet au corps d'étrier de coulisser sur la suspension du véhicule de telle sorte qu'il est mobile par rapport au rotor de frein, et au moins un ensemble piston monté de manière mobile dans un trou dans le corps d'étrier et ayant une extrémité reliée à un patin de frein intérieur.
PCT/US2012/054447 2011-09-09 2012-09-10 Frein de stationnement à étrier coulissant ayant une rétraction de patin de frein positive WO2013036923A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/229,044 2011-09-09
US13/229,044 US9145120B2 (en) 2011-09-09 2011-09-09 Sliding caliper parking brake having positive brake pad retraction

Publications (1)

Publication Number Publication Date
WO2013036923A1 true WO2013036923A1 (fr) 2013-03-14

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Application Number Title Priority Date Filing Date
PCT/US2012/054447 WO2013036923A1 (fr) 2011-09-09 2012-09-10 Frein de stationnement à étrier coulissant ayant une rétraction de patin de frein positive

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US (1) US9145120B2 (fr)
WO (1) WO2013036923A1 (fr)

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CN114370465A (zh) * 2018-11-03 2022-04-19 达尼克有限责任公司 一种制动系统
CN115199680A (zh) * 2022-07-08 2022-10-18 潍柴动力股份有限公司 一种行走马达用强制解除制动装置及方法

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